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Po455 generic evaporative emission system leak gross leak no flow

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Diagnostic Trouble Code (DTC) P0455 basicly means that the Powertrain Control Module (PCM) does not see any change in the Fuel Tank Pressure Sensor (FTP) when: (A) vacuum is applied through the Purge Control Solenoid or (B) When the system is tested by the leak detection pump.

The code description says "GROSS LEAK/NO FLOW " because the PCM cannot tell if the problem is being caused by a large leak in the EVAP system components or if the problem is that the purge valve is not opening when it is commanded to do so.

The MOST COMMON cause of this code is either refueling the vehicle with the engine running or a fuel cap that is not installed properly. Check your fuel cap and make sure that the rubber seals in the cap are not dammagedor full of cracks. If you find obvious damage to the fuel cap seals, replace the cap. Otherwise, install the cap and make sure it "clicks" when you twist it on. The Malfunction Indicator Light (MIL) (also known as Check Engine Light) will go out in a couple of days if this was the problem. If it does not go out, then the system will need to be diagnosed.

POSSIBLE CAUSES:
> Loose, damaged, or improperly installed fuel cap
> Damaged, cracked or disconnected vacuum/purge hoses or lines.
> Faulty Purge Control Solenoid Valve
> Defective Leak Detection Pump
> Defective FTP sensor
> Defective PCM

This code cannot be caused by circuit failures unless this code is accompanied by other codes indicating circuit failures in one or more of the EVAP system components. In this case, the circuit failures MUST be addressed FIRST.

Posted on May 27, 2011

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First thing to check is the gas cap, make certain it is tight and the cap seal is not damaged or cut. In many cases this is the root cause for the P0455.
If that checks good, you want to check the vacuum hoses from the EVAP purge solenoid under the hood, all the way back to the EVAP canister. Make certain all are connected and not damaged or cracked.
Let me know.
Regards,

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